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Target: combine addition across exclusive branches with multiplication inside each branch. Prepare: F, branch tree and method chooser.
Launch · 2 min. Ask whether F chooses visual and audio together. It chooses exactly one route.
Model · 4 min. Visual route 2 themes×3 layouts=6; audio route 2 narrations×2 paces=4; exclusive routes sum to 6+4=10.
Guided reading · 5 min. Enumerate visual leaves V11–V23 and audio leaves A11–A22. All ten are unique. Explain that 2×3×2×2=24 would require a label with all four attributes, which F does not.
Practice route · 7 min. Choose Day 7 route; draw or say branch counts, total and two decision words: AND inside, OR across.
Audit · 4 min. Repair 6×4=24; it counts a visual-audio pair, not one selected route.
Exit · 3 min. “What is F's number of complete choices?” Expected: 10, assuming route categories stay exclusive.